Add configuration flag to allow running the tests with valgrind

[aentinger]

Describe the request

As pointed out by @tttapa over here we can not enable address sanitizers since valgrind in CMakeLists.txt would refuse to run it. Consequently it would be desirable to have a configuration flag that would allow to disable using valgrind for running the tests.

Describe the current behavior

arduino/cpp-test-action always uses valgrind when running the unit tests, though there are situations where this may be not sensible to do.

'arduino/cpp-test-action' version

main

Additional context

No response

Issue checklist

• I searched for previous requests in the issue tracker
• I verified the feature was still missing when using the latest version
• My request contains all necessary details

[tttapa]

Another option could be to have a flag to switch between normal builds, valgrind builds, and Asan+UBsan builds (i.e. making the cpp-test-action aware of the sanitizers, rather than enabling them manually in the consuming projects).